Pulley



PULLEY Filed June 7, 19315 by an integral tubular Patented July 3l, 1934UNITED STATES;

PUVLLEY Thomas H. Shope, Southgate, Calif'.

Application June 7,

193.3, serial No. 674,701,A

6 Claims. (Cl. 254-192) designed for supporting cables, chains and hoselthat serve as conduits for fluid the principal objects of my or flexibletubes under pressure and invention are, to generallyimprove upon andsimplify the construction of the existing forms of pulleys and toprovide able the supporting flexible member toV travel over or aroundthe pulley with theleast possible development of friction.

Further objects of my invention are, to provide a pulley wherein arotating carrier is provided. adjacent to its periphery with a pluralityof independently rotating small pulleys that receive the supportedflexible member, further, to arrange in the upper portion of the frameor yoke of the pulley a pluralityof small pulleys that are effective inretaining the flexible member in proper operative position upontheseries of small pulleys that are carried by the main rotating frame andthereby counteracting backlash of the flexible member as it passes overthe pulley and further, to'provide simple and efficient.`

means for lubricating the main Lbearing -of the pulley.

With the foregoing and otherobjects inview,

my invention consists in certain novel features of construction andarrangements of parts that will be hereinafter more fully described andclaimed and illustrated in the accompanying drawing in which:

Fig. 1 is a side elevational view of the pulley constructed inaccordance with my invention.

Fig. 2 is a vertical section taken on the line 2-2 of Fig. 1.

Fig. 3 is a vertical section taken on the line 33 of Fig. 2.

Fig. 4 is a detail section taken on the line 4-4 of Fig. 1.

Fig. 5 is a detail section taken on the line 5-5 Of Fig. 2.

Referring by numerals to the accompanying drawing which illustrates apreferred embodiment of my invention, 10, 10 designate spaced disc-likewalls that are connected at their centers hub 11 and these walls and hubform the main rotating frame of the pulley.

Seated in the walls 10, between hub 11 and the edges of said walls, arethe end portions of a circular row of pins or spindles 12 and mounted torotate freely upon each spindle, is a small grooved pulley 13.

Extending through tubular hub 11, is a shaft or spindle 14, the ends ofwhich project slightly beyond the outer faces of the plates 10 and apulley that will env formed in this shaft or spindle between itsends, isa chamber 15 for the reception of a'suitable lubricant.

Formed through the wall of this shaft or spindle around lthechambertherein, in aseries of apertures 16.

The lower Vportions of the parallel legs of an inverted U+shaped yoke17,bear directly against the ends of shaft or spindle 14 and the connectedends of the legsy of this yokev occupy a position a short distanceoutwardly from the edges of the Walls 10. i

Swiveled tov the connected end of yoke 17, is a ring or eye 18 andAarranged between the swiveled end of said. ring and the yoke, is a wearreceiving collar 19.. i

In the event vof f excessive 'wear between the ring and yoke, the worncollar 19 may be removed and replacedby a new collar, therebyeliminating the necessity of replacement of the yoke or ring. g 1

`Mounted' on the projecting ends of shaft or spindle 14 andinterposed-between the legs of the yokev land theA ,outerfaces of plates10, are'wear receivingwashers 20. f I

Thershank of abolt 21 passesthroughsuitably formed aperturesfin'thevlegs of yoke V17 and through the shaft or spindle14 and the threaded endof this bolt receives a nut 22. Washers 23 are located between nut 22and the head of the bolt and the outer faces of the legs of yoke 17.

The threaded end of the shank of bolt 21 is provided with an axial bore24 and formed in the body of the bolt and establishing communicationbetween the inner portion of said bore 24 and the lubricant chamber 15,are apertures 25.

The outer end portion of the bore 24 is threaded for the reception of ascrew plug 26. This plug when removed, permits lubricant to be deliveredthrough bore 24 and apertures 25 into chamber 15 and any suitable means,for instance, a grease gun, may be utilized for forcing the lubricantinto said chamber. y

Plug 26, when seated in the end of the bolt, retains the insertedlubricant and the discharge of lubricant from chamber 15 throughaperture 16 effectively lubricates the hub of the rotating frame.

Seated in the legs vof yoke 17, adjacent to the connected ends of saidlegs and beyond the edges of the plates 10 of the rotary frame, are theends of spindles 27 and mounted for rotation on each spindle in the sameplane with the pulleys 13, are small grooved pulleys 28.

Arranged between the ends of these pulleys 28 and the legs of the yoke,and loosely mounted on the spindles 27, are spacing collars 29.

The iiexible member that is supported by the pulley bears on the groovedpulleys 13 and said flexible member passes beneath the pulleys 28 thatare carried by the yoke 17.

Thus the flexible member is always maintained in proper position uponthe pulleys 13 and in the event that the flexible member is suddenlyrelieved of heavy pulling strains, the pulleys 28 prevent backlash ofthe flexible memberand the destructive results thereof against theconnected end of yoke 17.

The series of small pulleys 13 arranged in a circle between the walls l0of the main rotating frame pro-vide a practically continuous rollingsupport for the flexible member that is carried upon the pulley, thusmaterially reducing friction and providing a substantial free-runningsupport for the chain cable or iiuid pressure hose.

-Obviously the yoke r17 vmaybevmade wider and the spindle 14 longer soas to accommodate two or more of the rotary frames carrying the pulleys13, thus providinga multiple pulley, wherein the rotary frames arearranged side by side and have the same axis. l

- Such construction is especially applicable for the crown blocks andtraveling blocks of well drilling rigs.

.Thusit will be seen that I have provided a pulley thatis relativelysimple in construction, inexpensive of manufacture and very eiective inperforming the functions for which it is intended.

It will be understood that minor changes in the size, form, andconstruction of the various parts of my improved pulley may be made andsubstituted for those herein shown and described without departing fromthe spirit of the invention, the scopeof which is set forth in theappended claims. Y. i

I claim as my invention: t 1. In a pulley, a framel comprising a pair ofspaced plates, a hub connecting the centers of said-plates, a yoke inwhich said frame is mounted for rotation, a series of grooved pulleysmounted for independent rotation insaid .frame between the spaced platesthereof, which pulleys a circle and a plurality of grooved pulleys.through said yoke'and spindle.

3. A pulley as set forth in claim 2, said bolt l having an axial boreand openings that establish ,communication between said bore and thelubricant chamber in said spindle.

4; A pulley as set forth in claim 2, said bolt having an axial bore, theinner end of which communicates with the lubricant chamber in saidspindle and removable means for closing the outer end of said axialbore.

5. In a pulley, an inverted U-shaped yokefa spindle mounted for rotarymovement between the ends of the legs of said yoke, a frame mounted forrotary movement on said spindle, said frame comprising a pair of spacedcircular plates and a hub, a series of grooved pulleys mounted forindependent rotation insaid 4frame between said spaced plates, whichpulleys Vare arranged in mounted for rotation in said yoke in the sameplane with the pulleys that are carried by said frame.

6. In a pulley, an inverted U-shaped yoke, a bolt passing through theends of the legs of said yoke, a spindle mounted for rotary movement onsaid bolt between the legs of the yoke, said bolt and spindle havingcommunicating'lubricating chambers, a frame mounted for rotary movementon said spindle, said frame comprising a pair of spaced plates andl ahub that surrounds the-spindle, a plurality of grooved pulleys mountedVfor independent rotation between the spaced plates of said frame,Whichrpulleys are arranged in a circle and a' plurality of groovedpulleys mounted vfor rotation in the yoke in the same plane with thepulleys that are carried bysaid frame.

l THOMAS'H. SHOPE.

